GT4 front caliper alternatives? Options

[Culpable04]

Cadillac Catera with 5 x 100 bolt pattern custom drilled on them

[bccentaur3]

Are there any 330mm rotors with a thickness of 30mm? I know the STi are 330x32

[Culpable04]

and of the Audi quattro is 330 x 30 but an adapter would be needed as the caliper can only accomodate ~ 315 MAX and if the disc is trimmed down you lose brake surface, as they have a groove below the audi's brake surface where our ST205 brake pad would fall on, so triming the disc is not an option there.

I actually still have these disc at home, maybe I'll take a picture of them before tossing them away.

[bccentaur3]

well i plan on using the ls430 calipers front and rear. I have brackets but they need to be machined. I believe the ls430 calipers have the same piston size as the celica so no issues with brake bias really.

[Culpable04]

if you can get your hands on ST205 disc those also work, the only issue with them is the cost + shipping since they are not available in US, that's why I adventure with a rotor I could source within US.

Cadillac Catera disc are readily avialable anywhere and jsut need to take to a machine shop or sometime the rotor supplier can drilled with for a small fee ( I paid 15 dollars )

so in the end cost of Catera disc + custom bolt pattern fees = a lot cheaper than ST205 disc.

[DIONYZUZ]

if you can get your hands on ST205 disc those also work, the only issue with them is the cost + shipping since they are not available in US, that's why I adventure with a rotor I could source within US.

Cadillac Catera disc are readily avialable anywhere and jsut need to take to a machine shop or sometime the rotor supplier can drilled with for a small fee ( I paid 15 dollars )

so in the end cost of Catera disc + custom bolt pattern fees = a lot cheaper than ST205 disc.

I was thinking of just getting some ST205 rotors off eBay (not cheap) after getting some SS Goodridge brake lines. As far as the rear twin piston GT4 calipers go... Do they bolt on to the GT-USDM rotors or do the GT4 rotors bolt on with the GT4 calipers on the MP strut system?

[Culpable04]

for the rear ST205 brakes you need the ST205 disc, USDM gt disc won't work, and they are almost a bolt on, just need ~ 5 mm spacers on the caliper brakets, this can be fixed with washers, very simple.

[DIONYZUZ]

Okay so all of the machining needs to be done on the front brakes (Caliper mounting trimmed a few mm and rotor diameter trimmed to 300mm), But for the rear brakes the opposite; a spacer is needed on the caliper mounting braket. And the rear ST205 rotor bolts on?

[Culpable04]

yes

[njccmd2002]

I have an idea of a double piston caliper that may fit, but need to try it. illl keep updated.

[Johnnyny]

I have an idea of a double piston caliper that may fit, but need to try it. illl keep updated.

which one mystery man ?

[UniqueGT4]

Where can I get a hold of the ST205 rear caliper and rotors with lines

[bccentaur3]

Ebay, I'm sure the stock GT rear lines would work.

[njccmd2002]

I have an idea of a double piston caliper that may fit, but need to try it. illl keep updated.

which one mystery man ?

well i have seen some lexus es330 with dual piston, but have yet to get ahold of one, they look very similar to ours, but have to look for a cheap one, as its trial an error.

[UniqueGT4]

Thanks bro

[Culpable04]

I have an idea of a double piston caliper that may fit, but need to try it. illl keep updated.

which one mystery man ?

well i have seen some lexus es330 with dual piston, but have yet to get ahold of one, they look very similar to ours, but have to look for a cheap one, as its trial an error.

when you get a hold of it, bolt it on and measure the distance from the hub to the center line of the caliper( there is usually a cast line right on the center of it ), then add 1/2 of the disc brake thickness to that number ( ES300 disc ) and you'll get the height needed for the caliper to work with no modification, if the number is higher than 56 mm you'll need to grind some from the inner side of the caliper bracket to bring it to or around 56.

any disc with an offset higher than 56 mm will touch the ball joint during hard cornering. that's why I use a 3 mm spacer on my cadillac catera disc ( 58.2 mm height )

good luck and hopefully you find that caliper for dirt cheap.

This post has been edited by Culpable04: Oct 5, 2010 - 6:50 PM

[njccmd2002]

^^^ i just bought a right caliper on ebay. will keep posted